//定义懒加载插件
import { useIntersectionObserver } from '@vueuse/core'
export const lazyPlugin = {
    install (app){
        //懒加载指令逻辑
        app.directive('img-lazy',{
            mounted(el,binding){
                const { stop } = useIntersectionObserver(
                    el,
                    ([{ isIntersecting }]) => {
                      if (isIntersecting) {
                        // 进入视口区域
                        el.src = binding.value
                        stop()
                      }
                    },
                  )
            }
        })
    }
}